184 CARL BOVALLIUS, AMPHIPODA HYPEFJ1DEA. I. 2. HYPERIIDJE. 



Hyperia galba. 



hairs: carpus infero-anteriorly produced to quite half the length of the propodos, having the 

 margin fringed with stiff hairs; propodos slender, long, rather longer than the carpus, cylindrical, 

 slightly curved, more so on the superior than on the inferior margin; dactylos slender, sharp. 

 Pereiopoda subequal. Penultimate pair of pleopoda shorter than the preceding or ultimate: 

 ultimate pair having the peduncle as long again as the telson; rami about half the length of 

 the peduncle, serrated. Telson broadly lanceolate. Length 9 / 20 of an inch.» 



In 1868 Spence Bate and Westwood gave the following description: 



» — — — — The arms are small, and differ but slightly; the second pair have the hand 

 somewhat the longer, and the wrist somewhat more infero-anteriorly developed than in the first 

 pair; both have the margin of the wrist fringed with strong but not very sharp spines. The 

 walking legs are nearly of one length, and tolerably robust. The caudal appendages are broad 

 and flat, and have the i*ami serrated at the margins. The peduncle of the last pair reaches 

 quite to the extremity of the preceding, and the middle piece consists of a small lanceolate 

 scale. The colour of the species, except the green eyes is fawn, or faint yellow, passing into a 

 salmon tint soon after the animal is put into spirits; it is also dotted all over with small specks 

 of red.» 



•»Specific character. Cephalon large; pereion distended; pleon compressed. Antennae short, 

 having the flagella terminating in a few scarcely-visible articuli. First pair of gnathopoda having 

 the carpus broad, but not obliquely produced; second pair having the carpus infero-anteriorly 

 produced. Peduncle of the posterior pair of pleopoda reaching to the apex of the rami of the 

 preceding pair. Telson lanceolate. Length l / 2 inch.» 



That the authors themselves had some suspicion of the closer relationship of their 

 Hyperia galba to H. rued us arum of Spence Bate is clear from the following passage 

 which concludes their description: 



«Among the several specimens sent to us from Banff, were a few of smaller size, which 

 differed from the others in having much shorter antennas, the inferior being the shortest, and 

 terminating in a more obtuse extremity than in the larger specimens. We were at first inclined 

 to describe them as a distinct species, but, all other conditions being considered, we feel certain 

 that they are only immature specimens, a circumstance which induces us to think that probably 

 H. medusarum (Fabr.) of the Arctic sea may likewise be but the young of this or some other 

 species.» 



In 1869 Norman recorded Hyperia galba from the Shetland Islands and in 

 1874 M'Intosh from St. Andrews, but in the latter case under the name H. medusarum, 



0. F. MfjLLEK. 



In 1874 too J. Ritzema Bos recorded Hyperia galba from Walchercn, on the 

 coast of the Netherlands, expressely referring to the description of Spence Bate and 

 Westwood, but, as he did not give any characteristics of the species, it is impossible to 

 tell if it were the true H. galba, which he had observed. The same may be said with 

 regard to H. medusarum (0. F. Mulleh), given by Hoek the present year in his list 

 of the Crustacea of the Netherlands, which is cited above under H. galba only because 

 he refers to Ritzema Bos as the first who recorded the species from the Netherlands. 



Within the limits I am here assigning the species may be distinguished from its 

 allies by the relative shortness of the first two pairs of perasopoda., by the carpus of the 

 first pair being a little produced and provided with a single notch on the hind margin, by 

 the carpal process of the second pair being fully half as long as the hind margin of the 

 metacarpus, by the femur of the last three pairs being comparatively broad, considerably 



